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Former world number one Tiger Woods has announced he will return to competitive golf in October.

The former world number one has been out of action since August last year due to serious back problems which have required surgery.

The 40-year-old has now stated his intention to compete at the PGA Tour's Safeway Open in Napa, California.

My rehabilitation is to the point where I'm comfortable making plans, but I still have work to do. Whether I can play depends on my continued progress and recovery. My hope is to have my game ready to go.

I'm looking forward to going to California for my foundation event and Safeway. I'm also excited to return to Turkey and Albany. It could be a fun fall.

It was difficult missing tournaments that are important to me, but this time I was smart about my recovery and didn't rush it. It was great spending time with my children Sam and Charlie, and also working on a lot of projects including golf-course design, the upcoming 20th anniversary of my foundation and my book about the 1997 Masters. But I missed competing. I want to thank all the fans for their kindness and concern. I've been a pro about 20 years, and their support has never waned.

American Jimmy Walker clinched his first major title by one shot over Jason Day after a busy day to finish the PGA Championship in Baltusrol on Saturday.

Walker, who along with 48 others did not manage to finish the third round on Saturday due to heavy rain and lightning, carded a three-under-par 67 in the last round to post a 14-under total.

One stroke ahead of world number one and defending champion Day at the end of the third round, Walker tightened his grip on the title with birdies at 10th and 11th holes before adding another at the 17th.

He secured his victory by sinking a three-footer for par at the last hole.

US Open champion Dustin Johnson has become the latest golfer to withdraw from the Olympics over fears of the Zika virus.

Several players including world number one Jason Day and four-time Major winner Rory McIlroy have already pulled out of Rio 2016 citing worries over the virus and Johnson has become the first American to do so.

Zika is a mosquito-borne virus which has been linked to defects in newborn babies.

"As an athlete, I can think of no greater honor than representing the United States in the Olympic Games," Johnson said in a statement released by his agent David Winkle.

"However, after much careful consideration and discussion with both my family and my team, I have made the decision to withdraw from the 2016 Olympic Games."

Jason Day has pulled out of the Rio Olympics because of concerns over the zika virus.

The Australian's decision to pull out of the Games follows that of fellow golfer Rory McIlroy.

In a statement released on twitter, he said: "The reason for my decision is my concerns about the possible transmission of the zika virus and the potential risks that it may present to my wife's future pregnancies and to future members of our family.

"Medical experts have confirmed that while perhaps slight, a decision to compete in Rio absolutely comes with health risks to me and to my family.

"While it has always been a major goal to compete in the Olympics on behalf of my country, playing golf cannot take precedent over the safety of our family."